If you have balanced and unbalanced signals running throughout your security system, a video balun can easily fix the problem.  Video balun adapters come in a variety of forms such as BNC connector or VGA/DVI.  These types of transmitters are available in either active or passive models.  Active transmitters require a power source, whereas passive transmitters do not need power.  There are many models with a variety of features to choose from depending on your security system needs.  You can purchase a single connection receiver or connect an 8-channel hub to your system to balance out your video signals throughout your entire system.